We have had our 6 girls for about a month now. We usually get 4 eggs a day--occasionally 3, a few times 5. Today we got 4 as usual, but one of them was very tiny. I don't know exactly how old any of my girls are since they were given to us, but I know that the woman who gave them to us has lots of hens of all ages. Mabye if one of our girls is from her spring batch of chicks? Could it possibly be that one of the girls is just beginning to lay and this is a practice egg?